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heated mirror ?

I have a 99 f350 with manual tow mirrors on it. I just got a set of heated mirrors with light and turn signal on it that came of a 05 f250. How does the heated part work in those mirrors? Is it on a thermostat or is it always on? I was gonna just wire them on a switch to turn them on when needed, but wondering how it all works. Thanks

On my 07 there wasn't any switch of any sort. I am not sure if they were always on of temperature controlled. I am leaning towards they were always on because if my truck was outside when at the cabin and there was dew on the mirrors the top glass would clear up and the bottom was full of dew still. The 05 thru 07 were the same style truck so I would assume they would be the same. I think in 08 they went to the rear defrost switch, our 08 ford company truck I was driving had that, as well as my personal 13 has a switch to turn them on.

i put a set of heated mirrors in my 02. ran a separate wire through the door wire loom to the dash, into a lit when on carling switch, to an ignition switched power source.
switch on, mirror heat on. switch off heat off. this is especially good for plowing because you do not have to hit the switch every 20 minutes to see out the mirrors because they time out after 10 minutes.
and they will not burn out being on all the time, the heated mirrors in semi trucks are hooked up the same way.